Dw621 pulsing speed problem

Contact them direct

https://www.donaldson.com/en-be/gas-turbine/

Various manuals here

https://www.google.com/search?q=donaldson+gas+turbine+filter+pulse+cleaning+system+FCP+Manual&

..

no its not gone. maybe its the paper filter issue. good luck! https://www.buybusinessclass.com/

It could be the filters need cleaned or replaced. Try turning it on without the filters on it, if it doesn't pulse on and off it may mean the filters are restricted and need cleaned or replaced. Do not use the vacuum without filters.

if fitting/ removing the filter makes a change ( filters no nothing but filter air), then the problem is the filter
if a new filter makes no difference to the problem , take it in to a sevice agent for repair

take it back for a warranty check / replacement

i am the same problem too.

Hi,
Looks like you've not shortage of advice on this issue. I would say that you have a thermal overload relay that is either bad, or going bad. If you don't have a warranty, you could open it up and try to find the relay and disconnect/bypass it. If this fixes the problem, do not continue to run. Immediately take the faulty relay up to Radio Shack or some other store that sells electronic components and such and replace it.
DO NOT CONTINUE TO RUN IT WITH OUT THIS RELAY, AS IT MAY RESULT IN IRREPARABLE DAMAGE TO THE UNIT OR EVEN FIRE!!!

check for debris in the head and remove

It is time for a battery replacement.

I would send it to protechrobotics. they will test all your components and let you know what needs to be done. if the repair is more than it's worth--they will help you out too.

http://www.protechrobotics.com/